Is engine braking still bad for the engine with oil injection?

[mbmO8]

Sorry if this is in the wrong section but I’ve been trying to find an answer to this question and I can’t find a clean cut answer.
I’ve got a 99’ Dtr (my first proper bike) and run the oil injection as well as a cap on oil in the tank. Will me engine braking damage the engine ?

[HOTSHOT III]

@mbmO8 Good question, within reason the short answer is no.

Closing the throttle at high engine speed is one of the problems Autolube solves because the pump being driven by the crankshaft means it's still delivering enough oil to prevent seizure.

It's fairly common on competition bikes running premix for them to seize if you chop the throttle at high rpm, like at the end of a long straight at a beach race for example.

To be honest I wouldn't be adding extra oil to the fuel as this can actually cause engine damage by creating a lean running condition; a percentage of oil mixed with the fuel equates to that percentage less fuel right across the engine's load and speed range. Autolube is one of the most reliable lubrication systems ever made; if you're worried, double check your oil pump adjustment/delivery rate and get an oil pump rebuild kit from Yambits if the pump is rebuildable. And run a genuine throttle cable as those £12 pattern ones aren't great.

[Calum]

Typically what are you gaining on a two stroke with engine braking... It's not like a four stroke.

When down shifting I always blip the throttle, to both rev match and maybe give it a squirt of oil.

I certainly wouldn't be going down a big hill engine braking the whole way at high rpm on a two stroke. Nice blips on the throttle and a high gear to keep the RPMs down.

When it comes to competition bikes, well reliability is all out the question and if engine braking does even a fraction of slowing down then it's worth it, but for road going use I only engine brake in an emergency.